also ahead, vice president joe biden surprise stop in the south bay before he wrapped up his trip to the bay area. >>> and check out this annual examination that had people at the academy of sciences treading sed >>> new this morning, a solar-powered plane trying to >> knew this morning, an earthquake in mexico city, close to the capital. it was about 76 miles from the capital. >>> vice president joe biden is back in washington this morning after a weekend bay area visit that included party fundraising and stumping for a south bay congressman. he also got to watch his grandniece receive her master's degree yesterday during ceremonies at stanford university. earlier in the day he surprised patrons and staffers at hobey's restaurant off highway 101 and moffett field. that unannounced visit was to support democratic support for a congressman who faces re-election battle. people were thrilled to see him walk in, shake hands and pose for pictures. >> my daughter said to him that her uncle calls him joey b, which he thought was funny. we had a great talk, keep up the great work. it's amazi